Bell-pipe mold



c. s. SORENSEN 1,750,138

BELL PIPE MOLD Filed March 5, 1928 March 11, 1930.

2 Sheets-Sheet l INVENTOR. C/auae .9. fore/x5e? BY 77mm M 77% .4 TTO RNESL5 March 11, 1930. c. s. SORENSEN BELL PIPE MOLD 2 Sheets-Sheet 2 FiledMarch 5, 1928 I N VEN TOR.

A TTORNEYJ.

Patented Mar. 11, 1930 PATENT OFFICE CLAUDE S. SORENSEN, OF LOS ANGELES,CALIFORNIA BELL-PIPE MOLD Application filed. March 5,

This invention relates to a mold for forming bell end cementitioustubular members wherein the cementitious material is setinto the moldand the material tamped while the jacket of the mold is rotated withrelation to the tampin stick. A specific application of the invention isto the manufacture of hell end concrete pipes employing an uprightcylindrical mold mounted on a rotatable turntable and a verticallyreciprocable tamping stick.

In the forming of such concrete pipes, it is the practice to provide amold jacket having a bell end and a cylindrical core nested therein andwhich is maintained substantially stationary with respect to thejacketof the mold, the latter being rotated. The tamping operation iscommonly performed by a machine until the level of the bell end has beenreached. Tamping is then stopped and a ring placed on the end of thecore to conform with the bell end of the jacket. Tamping is then resumedin the space at the bell end of the mold. Abviously such operationsrequire the machine to be stopped and labor employed to place the ringin position.

The present invention has for its primary object the provision of a moldfor bell end pipes wherein the complete formation of the pipe andtamping may be continuously proceeded with. A more specific object ofthis invention is to provide a bell core ring which is positioned on thecore at the beginning of operation and which will permit tamping of thebody and bell end without disturbing of the mold or machine.

Other objects and advantages will be made fully apparent from thefollowing specification considered in connection with the accompanyingdrawings in which Fig. 1 is a vertical section through a mold jacketmounted on a turntable and showing the core in elevation, my improvedring being mounted on the core with the tamping stick in position fortamping the body of a concrete pipe; Fig. 2 is a section of the upperend of the mold showing the core in elevation as seen on the line 22 ofFig. 1; Fig.

3 is a plan view of the mold as seen in Fig.

1; and Fig. 4 is a similar plan view with bell 1928. Serial No. 259,068.

core ring and tam in stick in osition tam ing the bell end. P g P pReferring with more particularity to the drawing, the mold is shownmounted upon a turntable 5, only a fragment of the latter being shown,it forming no part of the present invention. It is a common practice intamping machines for concrete pipe to mount the mold upon a rotatableturntable, securing the jacket thereto by any suitable means so that itwill be rotated with the turntable. A tamping stick 6 having a shoe atits lower end is reciprocated in the space between the jacket and core.The concrete is supplied by a chute 7 or any other suitable means. Thecore is shown in Fig. 1 with concrete inclicated by 8 partially fillingthe body space between the core and mold.

The jacket comprises a cylindrical body portion 9 and a bell end 10. Atthe bottom of the jacket is a foot member 11 for securing the jacket tothe turntable. This may be of any suitable construction such as is wellknown in the art.

Mounted within the jacket and supported upon a post is the core 12. Thecore has socket 13 in which is disposed a post 14 forming a centeringdevice and permitting rotation of the latter. A core shaft 15 isprovided whereby the core may be removed from the mold. Secured to theupper face of the core are arcuate clamps 16 preferably of .SDIlD metaland havin a aortion s aced from the face of the core to receive arms 17and yieldably hold the latter in position. Shoulders 18 are formed atthe front ends of the clamps to limit the angular position of the bellcore ring 19 to which the arms 17 are secured. The bell core ringcomprises a body 20 adapted to be disposed circumferentially of the endsof the core for forming the internal wall of the bell end. There is anend face wall 21, overhanging the space at the bell end of the mold.This wall is an arcuate segment so as to provide an opening for theoperation of the tamping stick and for the filling of the mold withconcrete. The filling space is indicated by 21' and at the rear thereofis a troweling wall 22 to move the concrete outwardly during the, bellform ing operation. The bell core ring is formed with a longitudinalpassage 23 in alignment with the space between the body of the core andthe body of the jacket for the accommodation of the tamping stick duringtamping of the body of the pipe. This passage has its rear wall formedby the ramp 24, and its front wall inclined peripherally as indicated by25, it also providing a secondary troweling surface.

It will be noted that the bell core ring is detachable, there being ineffect a bayonet connection between the core and ring. At the beginningof the formation of the pipe, the ring is placed on the core in theposition shown in Fig. 3. The tamping stick is reciprocated in the space23, the jacket being rotated. \Vhen the body of the pipe has been builtup to the bell end, the operation will cause the ramp 24 to pressagainst the tamping stick, and the latter will be forced outwardly tothe position shown in Fig. 4 where tamping is performed for the bellend. The formation of the pipe is continuous requiring no stoppage inthe operation, and the positioning of the tamping stick is automatic.

What I claim is 1. A mold for forming bell end cementitious pipes andtamping of the same comprising a main core normally stationary, a jacketrotatable with relation to said main core, a bell core ring on said maincore having a longitudinally extending passage aligned with the bodyspace betwen said jacket and core for accommodating a tamping stickcharacterized by the ring being turnable on said core including means tolimit the angular travel of said ring.

2. A mold for forming bell end cementitious pipes and tamping of thesame comrising a. main core normally stationary, a jacket rotatable withrespect to said main core, a bell core ring having a segmental arcuateWall overhanging the end of the bell, said extension having alongitudinally extending passage aligned with the body space betweensaid jacket and core for accommodating a tamping stick characterized bythe ring being turnable on said core including means to limit theangular travel of said ring.

3. A mold for forming bell end cementitious pipe and tamping of the samecomprising a main core normally stationary, a jacket rotatable withrelation to said main core, and a bell core ring on said core having alongitudinally extending passage aligned with the body space betweensaid jacket and core for accommodating a tamping stick, said passagehaving a rear peripheral ramp wall characterized by the ring beingturnable on said core including means to limit the angular travel ofsaid ring.

4. A mold for forming bell end cementitious pipe and tamping of the samecomprising a main core norgnally stationary, a acket rotatable withrespect to said core, and a bell core ring having a segmental arcuateWall overhanging the end of the bell, said bell ring core having alongitudinally extending pasaligned with the body space between saidjacket and main core for accommodating a tamping stick and said passagehaving a rear ramp wall characterized by the ring being turnable on saidcore including means to limit the angular travel of said ring.

5. A mold for forming bell end cementitious pipe and tamping of the samecomprising a main core normally stationary, a jacket rotatable withrelation to said core, and a bell core ring on said main core having alongitudinally extending passage aligned with the body space betweensaid acket and main core for accommodating a tamping stick, said passagehaving a rear ramp wall and a front inclined trowel wall characterizedby the ring being turnable on said core including means to limit theangular travel of said ring.

6. A mold for forming bell end cementitious pipe and tamping of the samecomprising a main core normally stationary, a acket rotatable withrelation to said main core, and a bell core ring having segmentalarcuate wall overhanging the end of the bell, said ring having alongitudinally extending passage aligned with the body space betweensaid jacket and core for accommodating a tamping stick and said passagehaving a rear ramp wall and a front inclined trowel wall characterizedby the ring being turnable on said core including means to limit theangular travel of said ring.

7. A mold for forming bell and cementitious pipes and tamping of thesame comprising a main core normally stationary, a jacket rotatable withrelation to said main core, a bell core ring on said main core having alongitudinally extending passage aligned with the body space betweensaid jacket and core for accommodating a tamping stick characterized bythe ring being turnable on said core and detachable therefrom andincluding means to limit the angular travel of said ring.

8. A mold for forming bell and cementitious pipes and tamping of thesame comprising a main core normally stationary, a acket rotatable withrelation to said main core, a bell core ring on said main core having alongitudinally extending passage aligned with the body space betweensaid jacket and core for accommodating a tamping stick characterized bythe ring being turnable on said core and including means to yieldablysecure said ring or said core and to limit rearward travel of said ringon said core.

In witness that I claim the foregoing I have hereunto subscribed my nameFebruary, 1928.

CLAUDE S. SORENSEN.

